Holden Astra BK (Hatchback) R+ Auto (2016-2020) Questions & Answers

Wondering what experience others have had with turnaround under warranty. Under 2 yo Astra r+ has so far had confirmed blown piston and cracked piston head - currently investigating whether its damaged the bore - to which Ive been told thisll mean a full engine replacement (26k on the engine!!). Im pushing for a courtesy car because Im stuck 30ks from the service centre with 3 kids and no car. while Im giving the dealer the chance to get things done (they havent finished their warranty process yet - but Ive been told their warranty lady goes on leave tomorrow) Im worried if I dont start to push Ill be stuffed for at least another week. Would appreciate some guidance on a way to expedite the process - no doubt Holden hasnt even had anything through from the dealer as yet.